Hadroproduction of the charmed baryon \' IND.C\' in the experiment SELEX-781.

Author(s)

Fernanda Gallinucci Garcia

• Document type: Doctoral Thesis
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Instituto de Física (IF/SBI)
• Defense date: 2000-02-15

Examining board members

Carlos Ourivio Escobar; João Carlos Costa dos Anjos; Frederique Marie Brigitte Sylvie Grassi; Marina Nielsen; Sandra dos Santos Padula

• Advisor: Carlos Ourivio Escobar

Abstract

The SELEX experiment at Fermilab took data during 18 months (February 96 - September 97) and collected approximately 15 billion hadronic interactions, using a 600 GeV/c secondary beam with equal amounts of - and - and 500 GeV/c próton beam on copper and carbon tar gets to study the production and decay of particles containing a charm quark. In this work results are presented on the inclusive production of the Ac+ and Ac- charm baryon where the Ac is reconstructed from its decay into pK. Specifically, we extract parameters of phenomenological models from fits to the acceptance corrected distributions of the Ac+ and charge conjugate, as a function of kinematic variables such as scaled longitudinal momentum (xF ) and transference moment squared (p2t ). A sample of 2500 ± 90 cs (and charge conjugate) was extracted in the course of the selection criteria. Correlations between the flavor quantum number of the beam and the produced particle are discussed. Large values of the asymmetry between Ac+ and Ac- as a function of xF, are obtained for baryon beam. In contrast, small asymmetry is found for the pion beam. The results are also compared to previous measurements by other experiments which used a - and - beam (AU)